Method for treatment of sludge
OwnerHans David Ulmert, Stefan Jâfverström +1inventors
InventorsHans David Ulmert, Stefan Jâfverström, Kjell Stendahl
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Abstract
Method for treatment of sludge, which includes precipitated aluminium and/or iron hydroxide, whereby the sludge first is added acid and thereafter is subjected to at least one membrane filtration process, whereby a permeate or a concentrate is obtained, including trivalent aluminium and/or iron ions in solution. The aluminium and/or iron ions in the permeate, or concentrate, are crystallised (salting out) in a precipitation.
Claims12
1-11. (canceled)
A method for treatment of sludge, which comprises precipitated aluminium and/or iron hydroxide, whereby the sludge first is added acid and thereafter is subjected to at least one membrane filtration process, whereby a permeate or a concentrate is obtained, including trivalent aluminium and/or iron ions in solution, wherein the aluminium and/or iron ions in the permeate, or concentrate, are crystallised in a precipitation.
Construction for treatment of sludge, which has been treated in a sludge treatment construction, whereby a permeate, or a concentrate, is obtained, wherein an alum crystallisation step to which the permeate, or concentrate, is led, and an alum separation step to which a solution is led.
Dependencies are inferred from the claim text.